Originally Posted by Heretic
They found Shaw because Emma was not trying to block him. Then she tried and blocked him.
The rest of your argument hinges on what happens in the comic book, and therefore is meaningless to what happens in the movie...
The point is that this "I can only use one of my powers at a time" thing is not mentioned at all in the movie, so the average viewer would not have any reason to think that way.
Well, now you know .. spread the word